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Finding the Fourth Proportional to 172.08, 237.42 and 133.20

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Solution

The fourth proportional to 172.08, 237.42 and 133.20 is: 183.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.08 : 237.42 = 133.20 : x
  2. Step 2: Convert to fraction form
    172.08/237.42 = 133.20/x
  3. Step 3: Cross multiply
    172.08x = 237.42 × 133.20
  4. Step 4: Simplify right side
    172.08x = 31,624.34
  5. Step 5: Solve for x
    x = 31,624.34/172.08
  6. Step 6: Final answer
    x = 183.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.